Tube-bending machine.



No. 647,766. Patented Apr. l7, I900.

P. H. SEERY'.

TUBE annme MACHINE. (Application filed. June 3, 1899.) (No Model.)3'Sheets-Sheet l.

, INVENTOR: .Patwmafll, 'wamy,

ATTORN EYS 1g: NGHRS sz-rzas 00.. PNOTO-LITHD., WASHINGTON n. c.

No. 647,766. Patented Apr. l7, I900.

- P. H. SEERY.

TUBE BENDIN'G MACHINE.

(Application filed June 3, 1899.)

(No Model.) 3 Sheats-Shet 2.

WWW" ///1% Y WITNESSES: I INVENTORS @7424 4 /&M, .Pfifi) 54601 9,, M 1 1BY M ATTORNEYS No. 647,766. Patented Apr. I7, 1900.

P. H. SEERY. TUBE BENDING MACHINE.

(Application filed June a, 1699. 0 Modem 3 Sheets-Sheet 3.

INVENTOR aw fl. 14 BY Wm. mars NITED STATES.

PATENT OFFICE.-

PETER H. SEERY, OF NEWARK, NEW JERSEY.

TUBE-'BENDING MACHINE.

SPECIFICATION forming part of Letters Patent no. 647,766, dated April17, 1906.

7 Application filed Jane 3, 1899. Serial No. 719,193.

marked thereon, which form a part of this specification.

The objects of this invention are to enable metal tubing to be bentwithout filling the bore of the tube with sand, lead, or the like,

to thus facilitate and lessen the expense of the bending, to obtain amore perfect bend, and to secure other advantages and results, some ofwhich may be hereinafter referred to in connection with'the descriptionof the working parts.

The invention consists in the improved metal-tube-bending machine and inthe arrangements and combinations of parts of the same, allsubstantially as will be hereinafter set forth and finally embraced inthe clauses of the claim.

Referring to the accompanying drawings, in which like letters ofreference indicate corresponding parts in each of the several views,Figure 1 is a plan of my improved bending-machine. Fig. 2 is a sideelevation of the same. Fig. 3 is a sectional view of a certainadjustable sliding frame, taken on line as, Fig. 2. Fig. 4 is a sideview'of certain cooperatin g dies and the bracket supporting the same.Fig. 5 is a plan View of said dies, on an enlarged scale and partly incentral horizontal section. Fig. 6 is a transverse sectional view takenat line y, Fig. 5; and Fig. 7 shows the cooperating peripheries ofcertain bending-rolls.

In said drawings, a indicates a suitable standard or upright postprovided with a broad base or foot 0., adapted to be secured to thefloor by screws a or the like, a solid support being thus provided forthe operating parts to be described. The top of said post 0. provides asocket and set-screw for a vertical arbor or pivotal pin b, which pinserves (No model.)

as a fulcrum for a lever a. Said lever c is made in upper and lowerhalves c" c, bolted together at the ends, as at 0 and between said endshaving their adjacent faces recessed to provide an open middle space din side view, which extends nearly thewhole length of the lever. Nearone end of the lever said sections 0 c are outwardly provided withintegral bosses e, and the lever is perforated from top to bottomcentrally through said bosses to receive the fulcrum-pin 1).. Abonding-rollf is also pivoted upon the pin 1), said roll lying in themiddle space at of the lever between the upper and lower halves, butindependent thereof.

At the outer end of the lever c farthest from its fulcrumal point themiddle open space at provides a slideway for an adjustable frame g, saidframe extending laterally beyond the sides of the upper and lower halvesc of the lever and having top and bottom vertical flanges g engagingsaid sides of the lever to prevent lateral displacement of the frame g.Said frame is clasp-shaped or U-shaped in side view, with its open endtoward the fulcrumed end of the lever, and between the upper and lowerarms 9 is pivoted upon a pin 77/2 a second bending-roll h, lying in thesame horizontal plane as and adapted to cooperate with thefirst-described roll f.

The outer end of the lever c is centrally and longitudinally perforatedand threaded to receive a handled screw 2', which at its inner endprojects into the space (1 of the lever. The inner extremity of thescrew i is devoid of threads and lies in a perforation in the end of thesliding frame g, the end of a pin j on the frame projecting into anannular groove j in said extremity. Any other means of connecting theadjusting-screwi to the frame suitable portionor extension (1 of thestandard'or post a and is provided with a verti-, cally-movable jaw 11,operated by a screw n, said clamp being in the same horizontal planewith the rolls f h and adapted to firmly hold a tube when in positionbetween said rolls, as is common. Bending is accomplished by turning thelever 0 upon its fulcrumal pin 1) through an arc of such length as isnecessary, as will be understood by one skilled in the art.

To prevent crimping or flattening of the tube as it is bent, I haveprovided the dies and related parts, which are shown in detail in Figs.4, 5, and 6 and which I will now describe. A female die 0, ofconsiderable length and having a cylindrical bore into which'the tube tobe bent will nicely fit, is disposed in the plane of the rolls f h atright angles to a line joining the centers of said rolls and on theopposite side of the lever c from the clamp m. The .end of said femaledie extends in between the rolls f h as far as possible and is for thispurpose somewhat pointed in plan view, with opposite rearwardly-beveledsides 0 0, adapted to engage the shoulders f h .on the rolls. Each ofsaid walls or sides 0 0 is further provided with aforwardly-projectfemale die 0 isa longitudinally-disposed male die ortriplet comprising a body part q of such diameter as to fit within thetube to be bent and a shank q, extending back from said 1 body part. Thebody part q of said triplet liesat the forward end of the female die 0,

projecting out therefrom to the line joining the center of the rolls fh. The shank q is: at its rear end threaded and screws through acorrespondingly threaded perforation in the closed rear end of thefemale die, thus en-I abling said triplet to be nicely adjusted in:longitudinal relation to-the female die. The .rear end of the tripletprojects beyond the die 0' and is [adapted to pass through an opena ingin the downwardly-extending arm 1" of a 1 bracket 0" and receive a nuts, by which thej dies are firmly securedto said bracket. main part ofthe bracket '1' extends parallelj .to the dies and is adapted to lieacross thef top of the lever c and be screwed thereto, the

dies extending through the open space 61 of the lever.

The clamp m is then tightened upon the tube. Theadjust-able 'roll hisslid up against the tube, the lever c swung I upon its pivot, and aperfect bend secured without crimpingor flattening,

The 1 The end 7 of said bracket 2)" oppositeqto the armr' projectsbeyond the lever c; to serve as a stop and'engage the face of thei fixedclamp m to insure the lever 0 being brought to a standstill with thedies -0 q di-' rectly in line with the jaws of said clamp; With theparts in this position the end of the tube to be bent is pushed throughthe clamp m between the rolls f h and into the female die 0 on theotherside, the triplet passing inside of the tube.

To limit the distance into the dies which the tube may be pushed, and tothus enable a bend'to be produced at any given distance from the end ofthe tube, I have provided a sliding stop t on the female die, as shownmore particularly in Figs. 5 and 6. Said stop slides longitudinally in'aslot u in thefemale die 0 and has at the inner end projecting wings t,which lie in the annular space between the male and female dies. Theouter end is threaded to receive a nut 16 for setting the stop at anydesired point, and the outer end may also carry a pointer 12, whichshows on a graduated scale at the side of the female die the distance atwhich the bend will bemade from the end of the tube with the stop atthat point.

It will be understood that various changes and modifications maybe madefrom the exact construction described without departing from the spiritor scope of the invent-ion, and Ido not wish to be understood aslimiting myself by the-positive descriptive terms employed' except asthe state of the art may require.

Having thus described theinvention, what I claim as new is+ 1 1. In atube-bending machine, a standard or post providing a pivoted pin, alooped lever fulcrurned near one end upon said pin,a roll pivotallyturning upon said pin and lying within the lever, an adjustable framesliding in said looped lever without connection to the lever and a rollpivoted in said frame and adapted to cooperate with the first roll,substantially as set-forth.

2. -A tube-bending machine, comprising a lever consisting of upper andlower sections oppositely bent or concaved and'providing an opening orslideway between, said lever being pivoted near one end, a bending-rollpivoted upon the same pin with said lever and lying in theopeningthereof, a frame sliding longitudinally in said s-lideway of thelever and being free from connection tothe sections of the lever, saidframe having side flanges lying outside the slideway and preventinglateral displacement, a second bending-roll pivoted in said frame andmeans for sliding said frame, substantially as set forth.

3. Ina tube-bending machine, the combination of'a lever comprising upperand lower sections oppositely concaved or bent apart for themiddleportion of their length and separably connected at the ends, said leverbeing perforated near one end to receive a jecting toward the fulcrumalpointof the lever, a second bending-roll pivoted between IIO said armsand an adj listing-screw for moving the frame longitudinally,substantially as set forth.

4-. A tube-bending-machine, comprising an Oscillating lever, cooperatingrolls pivoted on said lever, a fixed clamp at one side of said leveradapted to hold the tube, and a mov able mandrel at the opposite side ofthe lever adapted to enter the tube, substantially as set forth.

5. In a tube-bending machine, a lever carrying cooperating bending rollsbetween which the tube extends, and a mandrel supported upon said leverand lying in the line of tangency of said rolls, substantially as setforth.

6. In a tube-bending machine, a lever carrying. cooperatingbending-rolls between which the tube extends,"a stationary clamp at oneside of the lever for holding the tube, and a mandrel and die at theopposite side of the lever and movable with said lever, substantially asset forth.

7. In a tube-bending machine, an oscillat ing lever carrying cooperatingrolls between which the tube extends, a mandrel supported upon saidlever and projecting therefrom at right angles at the point of openingbetween said rolls, said mandrel being in front of the lever as it isoscillated, substantially as set forth.

8. In a tube-bending machine, an oscillating lever, cooperatingbending-rolls pivoted in said lever, a fixed clamp adapted to hold thetube with its end extending between the rolls at right angles to theline joining the centers of said rolls, and a mandrel and inclosing diecarried by the lever and receiving the end of the tube whichprojectsbeyond the lever on the opposite side from the fixed clamp,substantially as set forth.

9. In a tube-bending machine, a lever carrying bending-rolls, a fixedclamp, a rigid bar fixed transversely to the lever and at one endengaging said clamp to stop the lever in a position at right angles tosaid clamp, and at the other end supportinga mandrel and die,substantially as set forth.

10. In a tube-bending machine, a mandrel fitting the interior of thetube and a female die inclosing the tube and mandrel, said mandrel anddie being carried just ahead of the point of bending, substantially asset forth.

11. In a tube-bending machine, a rigid mandrel fitting inside of thetube, and a female die inclosing the tube, said mandrel and die holdingthat portion of the tube which is to be bent and always extending to thepoint of bending, substantially as set forth.

' 12. In a tube-bending machine, an oscillating lever carryingcooperating rolls around one of which the tube is adapted to be bent,and a cooperating mandrel and die carried by the lever and holding thatpart of the tube which is about to be bent against distortion,substantially as set forth.

13. In a tube-bending machine, a cooperating die and mandrel holding theend of the tube which is about to be bent, said die coni prising a blockhaving a bore adapted to re ceive the tube and said mandrel beingcentrally disposed in said die and adapted to enter the tube, and saiddie and mandrel being carried along said end of the tube just in advanceof the point at which bending is taking place, substantially as setforth.

14. In atube-bending machine, a cooperating die and mandrel for holdingthe part of the tube to be bent, said die having a bore receiving thetube and said mandrel being centrally disposed in said die and havingits end threaded to screw in cooperating threads at the'end of thefemale die, whereby relative adjustment of the parts may be made,substantially as set forth.

15. In a tube-bendin g machine, the combination with cooperatingbending-rolls having grooved peripheries, of a die into which the end ofthe tube to be bent extends and a mandrel longitudinally and centrallydisposed in said die and fitting the interior bore of the tube, said diehaving its end lying closely adjacent to the meeting peripheries of therolls and said mandrel extending to the line joining the centers of saidrolls, said die and mandrel being carried ahead of the bending-rolls andexposing the tube to their action as they move forward, substantially asset forth.

16. In a tube-bending machine, the hereindescribed cooperating die andmandrel for holding the end of the tube to be bent, said die beingslotted at one side, and a stop having a foot lying in the chamber toengage the tube and a shank lying in said slot, and a nut at the outerend of the shank for setting said stop in any desired position,substantially as set forth.

17. In a tube-bending machine, the hereindescribed die and mandrel forpreserving the shape of the tube adjacent to the point of bending, saiddie being longitudinally slotted at one side, a stop for the end of thetube movable in said slot, means for fixing said stop in position and apointer carried by said stop and cooperating with a scale on the die,substantially as set forth.

18. In a bending-machine, the combination with a lever carrying abending-roll around a cooperating roll, of means for holding thatportion about to be bent against distortion, saidmeans being carriedupon the leverjust in advance of the point of bending, substantially asset forth.

In testimony thatI claim the foregoing I have hereunto set my hand this1st day of June, 1899.

PETER II. SEERY.

Witnesses:

O. B. PITNEY, RussELL M. EVERETT.

